Are you looking for a no-prep digital activity that gives students instant feedback? Mystery riddles are a fun way to practice, and end with a bonus. When an answer is correct, the cell turns green and part of the mystery riddle appears! When an answer is incorrect, the cell turns red, so students know to try again. When students answer all questions correctly, they get to solve a riddle! Topics in this bundle include function notation, slope formula, finding x- and y-intercepts, solving systems